99401551 has 4 divisors (see below), whose sum is σ = 99421504. Its totient is φ = 99381600.

The previous prime is 99401539. The next prime is 99401579. The reversal of 99401551 is 15510499.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15510499 = 479 ⋅32381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99401551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99401501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4471 + ... + 14791.

It is an arithmetic number, because the mean of its divisors is an integer number (24855376).

Almost surely, 2^99401551 is an apocalyptic number.

99401551 is a deficient number, since it is larger than the sum of its proper divisors (19953).

99401551 is a wasteful number, since it uses less digits than its factorization.

99401551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19952.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 99401551 is about 9970.0326478904. The cubic root of 99401551 is about 463.2311120813.

The spelling of 99401551 in words is "ninety-nine million, four hundred one thousand, five hundred fifty-one".